MochaでテストしているコードでgetCustomRepositoryすると EntityMetadataNotFound: No metadata for "***" was found.が発生する

発生したエラー

     EntityMetadataNotFound: No metadata for "Application" was found.
      at new EntityMetadataNotFoundError (src\error\EntityMetadataNotFoundError.ts:9:9)
      at Connection.getMetadata (src\connection\Connection.ts:316:19)
      at EntityManager.getCustomRepository (src\entity-manager\EntityManager.ts:781:86)
      at Connection.getCustomRepository (src\connection\Connection.ts:351:29)
      at Object.getCustomRepository (src\index.ts:287:55)
      at Function.<anonymous> (src\models\applications.ts:155:17)
      at Generator.next (<anonymous>)
      at fulfilled (src\models\applications.ts:4:58)
      at <anonymous>

該当するコードを追跡する

Connection.ts

    /**
     * Gets entity metadata for the given entity class or schema name.
     */
    getMetadata(target: Function|EntitySchema<any>|string): EntityMetadata {
        const metadata = this.findMetadata(target);
        if (!metadata)
            throw new EntityMetadataNotFoundError(target);

        return metadata;
    }

Connection.ts

    /**
     * Finds exist entity metadata by the given entity class, target name or table name.
     */
    protected findMetadata(target: Function|EntitySchema<any>|string): EntityMetadata|undefined {
        return this.entityMetadatas.find(metadata => {
            if (metadata.target === target)
                return true;
            if (target instanceof EntitySchema) {
                return metadata.name === target.options.name;
            }
            if (typeof target === "string") {
                if (target.indexOf(".") !== -1) {
                    return metadata.tablePath === target;
                } else {
                    return metadata.name === target || metadata.tableName === target;
                }
            }

            return false;
        });
    }

実際にデータがどうなっているのか？

引数のtargetとプロパティthis.entityMetadatasの値をおってみる

Connection.ts

    protected findMetadata(target: Function|EntitySchema<any>|string): EntityMetadata|undefined {
+    console.log("target", target);
+    console.log("this.entityMetadatas", this.entityMetadatas);

target

class Application {
}

this.entityMetadatas

[ 
  : ,
  EntityMetadata {
    :
    target: [Function: Application],
    : 
  },
  :
]

仮説

TypeScript形式のclass Application {}とJavaScript形式Function: Applicationと名前の不一致ではないか？